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is x 4 + y 4 z 4 1 x 2 + y 2 z 2 2 x + y z
x y z 1 x 2 y 2 z 2 2 x 3 y 3 z 3 3
x 2 + y 2 + z 2 x + y + z 2 + xy + yz + zx 2
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